The NRO Star Formation Legacy Project is a large project to make wide-field molecular line maps of nearby star-forming regions at 25 arcsecond resolution using the Nobeyama 45-m radio telescope. It started in 2014, and finished in 2017 May. The target regions are (1) Orion A, (2) Aquila Rift, and (3) M17 SWex molecular cloud complexes. Each target cloud was mapped with the newly-developed 100 GHz-band 4-beam dual-polarization receiver (FOREST, from 2014), 25-beam single-polarization receiver (BEARS), and single beam dual-polarization TZ receiver. The powerful new receiver FOREST is particularly well suited for conducting large-scale mapping observations.